unable to resolve dependency tree when running npm i #105

npm error code ERESOLVE
npm error ERESOLVE unable to resolve dependency tree
npm error
npm error While resolving: source@1.5.0
npm error Found: postcss@8.2.13
npm error node_modules/postcss
npm error   dev postcss@"8.2.13" from the root project
npm error
npm error Could not resolve dependency:
npm error peer postcss@"^8.2.15" from cssnano@5.1.12
npm error node_modules/cssnano
npm error   dev cssnano@"5.1.12" from the root project